The proof of Lemma REF  reproduces the ideas of the proof of the classical case when \(X=\mathbb {C}\)  and \(\Phi =L^p\)  from [1]}. Since the proof, even in the classical case, is somewhat complex and based on several ingredients in which formulation the characteristics \(p\)  and \(q\)  are involved, we sketch the line of this extension and underline the main supplementary observation should be made.
